110 research outputs found
Determination of 1-aminocyclopropane-1-carboxylic acid (ACC) synthase in Poa pratensis induced by mechanical or biotic factors and characteristics of the assay for ACC
Investigations into the nature of ethylene production by Bipolaris sorokiniana and B. sorokiniana infected leaf blades of Poa pratensis were the main objectives of this research. Characteristics of the assay for 1-aminocyclopropane-1-carboxylic acid (ACC) synthase, the enzyme that controls ethylene formation in higher plants, were also studied;Protein was found to interfere with the determination of ACC. Interference was partly overcome by modifying the assay procedure;Methionine (Met) and ACC stimulated ethylene production in B. sorokiniana. ACC was less effective than Met in stimulating ethylene production. Met decreased fungal growth and sporulation;Infection of P. pratensis by B. sorokiniana resulted in necrosis of the afflicted tissue. It was speculated that the host-pathogen interaction involved the contribution of the fungal ACC synthetic pathway and the ethylene forming pathway of the host
Renormalization algorithm for the calculation of spectra of interacting quantum systems
We present an algorithm for the calculation of eigenstates with definite
linear momentum in quantum lattices. Our method is related to the Density
Matrix Renormalization Group, and makes use of the distribution of multipartite
entanglement to build variational wave--functions with translational symmetry.
Its virtues are shown in the study of bilinear--biquadratic S=1 chains.Comment: Corrected version. We have added an appendix with an extended
explanation of the implementation of our algorith
High-Precision Numerical Determination of Eigenvalues for a Double-Well Potential Related to the Zinn-Justin Conjecture
A numerical method of high precision is used to calculate the energy
eigenvalues and eigenfunctions for a symmetric double-well potential. The
method is based on enclosing the system within two infinite walls with a large
but finite separation and developing a power series solution for the
Schrdinger equation. The obtained numerical results are compared with
those obtained on the basis of the Zinn-Justin conjecture and found to be in an
excellent agreement.Comment: Substantial changes including the title and the content of the paper
8 pages, 2 figures, 3 table
Perturbation Theory with a Variational Basis: the Generalized Gaussian Effective Potential
The perturbation theory with a variational basis is constructed and
analyzed.The generalized Gaussian effective potential is introduced and
evaluated up to the second order for selfinteracting scalar fields in one and
two spatial dimensions. The problem of the renormalization of the mass is
discussed in details. Thermal corrections are incorporated. The comparison
between the finite temperature generalized Gaussian effective potential and the
finite temperature effective potential is critically analyzed. The phenomenon
of the restoration at high temperature of the symmetry broken at zero
temperature is discussed.Comment: RevTex, 49 pages, 16 eps figure
Determination of 1-aminocyclopropane-1-carboxylic acid (ACC) synthase in Poa pratensis induced by mechanical or biotic factors and characteristics of the assay for ACC
Investigations into the nature of ethylene production by Bipolaris sorokiniana and B. sorokiniana infected leaf blades of Poa pratensis were the main objectives of this research. Characteristics of the assay for 1-aminocyclopropane-1-carboxylic acid (ACC) synthase, the enzyme that controls ethylene formation in higher plants, were also studied;Protein was found to interfere with the determination of ACC. Interference was partly overcome by modifying the assay procedure;Methionine (Met) and ACC stimulated ethylene production in B. sorokiniana. ACC was less effective than Met in stimulating ethylene production. Met decreased fungal growth and sporulation;Infection of P. pratensis by B. sorokiniana resulted in necrosis of the afflicted tissue. It was speculated that the host-pathogen interaction involved the contribution of the fungal ACC synthetic pathway and the ethylene forming pathway of the host.</p
Disputatio XIV. Ethica De Tolerantia, Mollitie, Misericordia & Verecundia
Quam ... In ... Academia Wittebergensi, Praeside ... Dn. M. Jacobo Martini ... Proponit ... Petrus Colemannus Stetino Pomeranus. Ad diem 22. Octob. ..
- …